The UML diagram which shows the interaction of object with other object in particular scenario of use case is known as Sequence diagram. It is a form of interaction diagram which shows objects as lifelines running down the page. It models the collaboration of objects based on a time sequence. It shows as parallel vertical lines (lifeline), different processes or objects that live simultaneously, and, as horizontal arrow, the message exchanged between them.
Class Role: It describe the way an object should behave in context. The uml object symbol to show class roles, but don’t list object attributes.
Activation: By this box the time taken by the object to complete a task is represented.
Messages: It is used to represent communication between objects.
Lifelines: Lifelines are vertical dashed lines that indicate the object's presence over time.
Destroying Objects: Objects can be terminated early using an arrow labeled "<< destroy >>" that points to an X.
Loops: A repetition or loop within a sequence diagram is depicted as a rectangle. Place the condition for exiting the loop at the bottom left corner in square brackets [ ].
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